Flexural strength of minimum thickness ceramic veneers manufactured with different techniques

Author(s)

Rizzante, Fabio A. P. ^[1] ; Soares-Rusu, Idiane B. L. ^[2] ; Senna, Suellen S. ^[3] ; Ramos-Tonello, Carla M. ^[4] ; Mondelli, Rafael F. L. ^[2] ; Ishikiriama, Sergio K. ^[2] ; Borges, Ana Flavia S. ^[2] ; Gutmacher, Zvi ^[5]

Affiliation

^[1] Case Western Reserve Univ, Sch Dent Med, Dept Comprehens Care, 9601 Chester Ave, Room 340, Cleveland, OH 44106 - USA

^[2] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Bauru, SP - Brazil

^[3] Univ Sao Paulo, Bauru Sch Dent, Sao Paulo - Brazil

^[4] FMU Educ Grp, Dept Restorat Dent, Sao Paulo, SP - Brazil

^[5] Rambam Healthcare Campus, Sch Grad Dent, Dept Maxillofacial Rehabil, Haifa - Israel

• Document type: Journal article
• Source: Quintessence International; v. 51, n. 4, p. 268-273, APR 2020.
• Web of Science Citations: 0

Abstract

Objective: The objective of the present study was to assess the effect of monolithic and bilayer restorations considering heat-pressed and milled/CAD/CAM reinforced lithium disilicate ceramic veneers, on the flexural strength after cementation. Method and materials: Thirty-five specimens were divided into five groups (n = 7), according to the restorative solution: 2-mm thickness composite resin (CR2); heat-pressed monolithic ceramic 0.6 mm (HPM), CAD/CAM monolithic ceramics 0.6 mm (CCM); heat-pressed monolithic ceramic 0.4 mm + 0.2 mm glass-ceramic (HPB); CAD/CAM monolithic ceramic 0.4 mm + 0.2 glass-ceramic (CCB). Specimens were cemented on composite resin bars and submitted to a three-point bending test on a Universal Testing Machine, until fracture. Fractured samples were analyzed under stereomicro-scope and SEM. Flexural strength data were analyzed by one-way ANOVA and Tukey test. Results: The control group showed the highest flexural strength results (119.57 +/- 19.49 MPa), with values similar to groups HPM (98 +/- 25.62 MPa) and CCM (96.14 +/- 20.60 MPa). Groups HPB and CCB showed lower values when compared with the other groups. Fracture started from the base on monolithic groups and from ceramic on bilayer groups. Conclusion: Both ceramic systems (CAD/CAM and heat-pressed) have similar fracture strength, although bilayer restorations present lower strength when compared with monolithic ceramics. (AU)

• FAPESP's process: 14/13575-4 - Flexural resistance evaluation of pressed and milled ceramic laminates
• Grantee: Suellen Scarcelli Senna
• Support Opportunities: Scholarships in Brazil - Scientific Initiation